Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
  • B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
  • B60C9/0042—Reinforcements made of synthetic materials
• • D—TEXTILES; PAPER
  • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
  • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
  • D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
  • D01F6/58—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products
  • D01F6/60—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products from polyamides
• • D—TEXTILES; PAPER
  • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
  • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
  • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
  • D02G3/44—Yarns or threads characterised by the purpose for which they are designed
  • D02G3/48—Tyre cords
• • D—TEXTILES; PAPER
  • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B2331/00—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
  • D10B2331/02—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyamides
• • D—TEXTILES; PAPER
  • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B2505/00—Industrial
  • D10B2505/02—Reinforcing materials; Prepregs
  • D10B2505/022—Reinforcing materials; Prepregs for tyres

Definitions

• the present invention relates to a high modulus nylon 6.6 twisted yarns as reinforcement in pneumatic tires and mechanical rubber goods.
• nylon 6.6 yarns have bi-elastic tensile properties, which means low initial modulus and higher final modulus.
• the low initial modulus makes the tire lifting/expansion process possible without any distortions in green tire, and high final modulus (modulus after transition point from low to high modulus) improves high speed tire durability as cap ply in pneumatic radial tires (PCR and LT).
• the objective of the present invention is to produce single twisted strands having high modulus as reinforcement in pneumatic tires and mechanical rubber goods.
• initial modulus or LASE (Load At Specified Elongation) values of nylon yarns and cords can be increased by applying high stretches at high temperatures.
• LASE Load At Specified Elongation
• nylon 6.6 yarns are stretched higher than 5% and less than 12% at a temperature range of 230- 250°C and wound up on bobbins or spools with a winding tension between 150g and 500g per yarn(strand).
• the same conditions are also valid for single twisted yarn fabrics as roll.
• the high modulus raw nylon 6.6 yarns are used instead of regular modulus raw nylon 6.6 yarns which resulted in improved fatigue resistance.
• the tensile stress value at 4% of the said raw nylon 6.6 yarns is greater than l,30cN/dtex, preferably between 1,35 and l,60cN/dtex (determined with tensile tester according to ASTM D885-16)
• the high stretched yarns having high modulus maintain their properties in bobbins, because they are not permitted to relax, and they are used in tire without experiencing significant relaxation (modulus drop).
• the high modulus yarns(strands) in high stretched fabrics also maintain their properties in rolls, because they are not permitted to relax, and they are used in tire without experiencing significant relaxation (modulus drop).
• the tensile properties of the high modulus nylon 6.6 twisted yarns are determined after 24 hours conditioning on spool (without unwinding) under winding tension at 24°C and with 55% relative humidity (ASTM D885-16). After conditioning, the twisted yarns are tested within lminutes after unwinding from the spool.
• test tabbies are conditioned as tabby (without separating and cutting out the yarns from tabby as fabric) under the same conditions as mentioned above. After conditioning, the yarns cut out from the tabbies are tested within 1 minutes.
• Such single twisted yarns have a stress at 4% elongation of 2.0cN/dtex (51g/dtex and 56.7g/d modulus) to 2.8cN/dtex (71.4g/dtex and 79.3g/d modulus) and a thermal shrinkage at 177°C of 4.0% to 7.0%.
• the nominal dtex of the yarn is taken as linear density (e.g. 1400 for 1400x1 construction).
• the modulus values are calculated by multiplying the stress values at 4% elongation with 25 in order to find the needed stress value for 100% elongation.
• the thermal shrinkage of yarns and cords are determined with a Testrite heat shrinkage tester under a pretension of 0.045g/dtex at 177°C with 2minutes exposure time.
• the heat shrinkage of the cords are within the limits of 4% and 7%, preferably 5.0% and 6.5%.
• the total nominal dtex of the cords can change between 300 and 4000dtex.
• the twist factors of the yarns are adjusted within 30 and 50, preferably 35 and 45 according to the following formula;
• Twist factor (t/m x SQRT (tex/1000)
• the high modulus nylon 6.6 twisted yarns(strands) can be used as reinforcement in pneumatic tires and mechanical rubber goods. Definitions:
• Dtex The gramm weight of yarn having lO.OOOmeter length.
• Denier The gramm weight of yarn having 9.000meter length
• Linear density Weight per unit length as g/dtex or g/d(denier)
• L5 Modulus Modulus at 5% elongation, (stress at 5% elongation) x20 as g/d or g/dtex
• Twist per meter Twist per meter (t/m or tpm)

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• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Mechanical Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• General Chemical & Material Sciences (AREA)
• Tires In General (AREA)
• Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)

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Citations (7)

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• 2016
  • 2016-06-08 MX MX2017016665A patent/MX2017016665A/es unknown
  • 2016-06-09 TR TR2017/09143T patent/TR201709143T1/tr unknown
  • 2016-06-09 KR KR1020177037492A patent/KR20190015068A/ko not_active Application Discontinuation
  • 2016-06-09 CN CN201680038624.XA patent/CN107949666A/zh active Pending
  • 2016-06-09 JP JP2017567651A patent/JP2019517627A/ja active Pending
  • 2016-06-09 US US15/740,002 patent/US10214838B2/en not_active Expired - Fee Related
  • 2016-06-09 WO PCT/TR2016/050175 patent/WO2017213600A1/en active Application Filing
  • 2016-06-09 HU HUE16748164A patent/HUE050384T2/hu unknown
  • 2016-06-09 RU RU2017146387A patent/RU2719962C2/ru active
  • 2016-06-09 BR BR112017028471A patent/BR112017028471A2/pt active Search and Examination
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  • 2016-06-09 EP EP16748164.7A patent/EP3469123B1/en active Active

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